Don’t know about elsewhere, but in the ACT one of the default OC rules permits the EC to enter a unit to investigate a suspected breach of the OC rules subject to giving reasonable notice. One of the other default rules requires compliance with any law in force in the ACT. So, if illegal activity is suspected, the EC could give reasonable notice and inspect. Of course that provides time for the drug lab to be disassembled and packed away. If nothing else it would put the drug maker on notice and create sufficient nuisance that they might decide to pack up for good.